Black Widow could wind up being a wild card. A spy for Cap. In the comics, one of the characters supposedly loyal to Tony was actually a spy for Cap. I believe it was Tigra who was the spy in the comics.
Apparently, Fox is going to try again to produce an X-Men themed tv series. They tried once before with Generation Next, based off the comics of the team that was led by Emma Frost and Banshee. Had Jubliee, Sync, Skin, Monet St. Croix, Paige Guthrie and Penance as part of the team in the comic. Show was short lived.